Describes the internal structure of muscles, showing that actin and myosin are the contractile elements of muscle. Uses a model to explain muscle contraction
notes: Red balance is a little high.
Muscles. Contract. And. There is movement. And fundamental to movement is the single muscle fiber the basic unit of contraction. When a fiber the voluntary muscle is examined under the light microscope a definite pattern of light and dark stripes or spry actions is observed. During contraction there is an obvious shortening of the entire fiber on more detailed examination however this contraction is seen to be the result of the much finer shortening of the strike action themselves. The substructure is responsible for this movement could not be adequately observed until the development of the electron microscope. Then the complex internal arrangement of the muscle fiber was revealed it was found that the fiber is made up of small substructures fibroids and the five boroughs in turn are composed of still smaller units which were named settlements. Two kinds of filaments could be distinguished relatively thin ones which form the light stripes and relatively think ones which form the dark stripes. This accounts for the stride appearance of the fibro. Examination of the fibro and cross-section showed that they component sentiments form a definite pattern. This pattern is due to the regular a range much of the thick and thin filaments. That think that all months on chemical analysis were found to be composed of the protein. Mild Senate while but then Solomon's are composed of the protein actin. Based on the visual evidence of the electron microscope studies or working model of how the filaments during contraction was constructed. It suggests the During contraction the punishment slide over and past one another. This is the sliding phenomena theory of muscular contraction. 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